STEVAL-ISA082V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – 4 A peak 800 kHz fixed-frequency PWM synchronous step-down demonstration board with enable on/off based on the ST1S40IPHR

STEVAL-ISA082V1
4 A peak 800 kHz fixed-frequency PWM synchronous step-down
demonstration board with enable on/off based on the ST1S40IPHR
Data brief
Features
■ Input voltage V_in : 4 V to 18 V
■ Output voltage V_out : 3.3 V
■ Maximum output current : 4 A
■ Switching frequency: 800 kHz
■ Short-circuit protected
■ RoHS compliant
Description
The STEVAL-ISA082V1, based on the
ST1S40IPHR, is an internally compensated
800 kHz fixed-frequency PWM synchronous step-
down converter demonstration board.
The ST1S40 operates from 4.0 V to 18.0 V input,
while it regulates an output voltage as low as
0.8 V and up to V_IN (100% duty cycle).
The ST1S40 integrates a 95 mΩ high-side switch
and a 69 mΩ synchronous rectifier allowing very
high efficiency with very low output voltage.
The peak current mode control with internal
compensation delivers a very compact solution
with a minimum component count.
The ST1S40 is protected through cycle-by-cycle
current limiting in case of overload and is also
protected by a current foldback function with
frequency reduction in case of short-circuit.
The device is available with an enable on/off
function.
STEVAL-ISA082V1
September 2011
Doc ID 022276 Rev 1
For further information contact your local STMicroelectronics sales office.
1/4
www.st.com
4